Rivet.



PATENTED OCT. 11, 1904.

D. G. CLARK.

RIVET.

APPLIUATION FILED NOV.21,1903.

X F52 F515.

- [@Zn E5559,

UNITED STATES Patented October 11, 1904.

PATENT OFFICE.

RIVET.

SPECIFICATION forming part of Letters Patent No. 772,029, dated October 11, 1904.

Application filed November 21, 1903. Serial No. 182,115. (No model.)

To all whmn it may concern:

Be it known that I, DWIGHT Cr. CLARK, a citizen of the United States, residing at Plainville, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Rivets, of which the following is a specification.

My invention relates to improvements in rivets; and the object of my invention is the production of a rivet that can be easily headed down, that will have a good form when headed down, and a rivet of a form that will enable the rivet to be cheaply produced.

In the accompanying drawings, Figure 1 is a side elevation of my rivet. Fig. 2 is a sectional view of the same on the line a: w of Fig. 1. Fig. 3 is a sectional view of the same in a plane at a right angle to the plane of section in Fig. 2. Fig. 4 is an end view of the rivet with its end headed down, together with a block from which the said end projects and upon which it is headed.

The said views are enlarged to four times the size of the particular rivet from which the said views were made.

The rivet, as shown, has a solid cylindrical body 5 and a head 6; but the particular form of the said body and head is not essential. The novelty of the rivet resides in the end thereof that is to be afterward headed down and to an extent in the relation of the said end to the body and head.

The end to be headed down is formed with a V-shaped transverse notch 7, that extends through the periphery and is preferably formed at an obtuse angle. A central recess 8 is formed in this notch, the said recess being preferably with sloping side walls and of a conical form and not only sunk below the bottom of the notch at the periphery of the rivet, but also extended upwardly on each side above the said bottom, as shown in Fig. 3. The central recess 8 is sunk only a short distance below the bottom of the said notch, and the said recess terminates at the outer end of the said body. In other words, it is only that portion of the rivet which projects beyond the bottom or termination of the recess that is designed to be changed in form during the riveting operation, and hence the outer end of the solid body practically determines the point at which the rivet will not ordinarily be enlarged by the riveting operation.

In Fig. 4the rivet is represented as having its end passed througha block 9, so as to project therefrom, and with the said end hammered down by a flat-faced hammer. The sides of the V-shaped notch in Figs. 1, 2, and 3 appear in the said Fig. 4 as the smaller ends 7 of oval-shaped riveted end, while a slight portion of the central recess remains as at 8.

By my improvement the end of the rivet may be easily and quickly headed down for securing it in place and may be flattened down by a flat-faced tool in an ordinary power-press. hen flattened down, the said end projects laterally more or less on all sides and has an oval form with practically an unbroken edge. While the said end is what may be called a split rivet, the recess at the bottom of the transverse notch makes the rivet something more than a split rivet. The riveted end constitutes a single member instead of being divided into lobes or different members, as in a split rivet.

I claim as my invention- 1. A rivet having a solid body and an end provided with a transverse notch, with a recess sunk in the said end below the bottom of the said notch and terminating at the outer end of the said body.

2. A rivet having a solid body with a head at one end, and having at the unheaded end a transverse notch with a recess sunk in the said unheaded end below the bottom of the said notch and terminating at the outer end of the said body.

3. A rivet having an end provided with a transverse notch and a recess with sloping side walls sunk in the said end below the bottom of the said notch, and also extending outwardly on the side members of the said notch above the bottom thereof.

DWIGHT G. CLARK.

Witnesses:

JAMES SHEPARD, H. S. Woons. 

